反应详情

温度

95 °C

To a stirred solution of 4-bromo-2-ethyl-2-methy-5-{4-(methylsulfonyl)-phenyl}-3(2H)-furanone (200 mg) in 15 ml toluene and 5 ml ethanol, were added 34 mg of tetrakis(triphenylphosphine)palladium(0), 5 ml of 2 M aqueous sodium carbonate solution, and 110 mg of 3,5-difluorobenzeneboronic acid. Then the reaction solution was stirred at 95° C. for 12 hours. The reaction solvent was evaporated off under reduced pressure and the resulting residue was extracted with 50 ml water and dichloromethane (30 ml×3). The organic layer was concentrated in vacuo. The resulting crude product mixture was purified by column chromatography (hexane/ethylacetate=2:1) to obtain 80 mg of 4-(3,5-difluorophenyl)-2-ethyl-2-methyl-5{4-(methylsulfonyl)phenyl}-3(2H)-furanone as a solid. mp: 122-124° C. NMR: δ0.95 (t, J=7.5 Hz, 3H), 1.54 (s, 3H), 1.97 (m, 2H), 3.10 (s, 3H), 6.81 (m, 3H), 7.84 (d, J=8.7 Hz, 2H), 7.99 (d, J=8.4 Hz, 2H). IR (cm−1): 2975, 2928, 1698, 1627, 1321, 1150, 990, 769, 552.

1. customThe reaction solvent was evaporated off under reduced pressure
2. extractionthe resulting residue was extracted with 50 ml water and dichloromethane (30 ml×3)
3. concentrationThe organic layer was concentrated in vacuo
4. customThe resulting crude product mixture was purified by column chromatography (hexane/ethylacetate=2:1)